Details

Autor(en) / Beteiligte

• Chiang, Cheng-Wei
• He, Xiao-Gang
• Li, Gang

Titel

Measuring the ratio of HW W and HZZ couplings through W+W−H production

Ist Teil von

• The journal of high energy physics, 2018-08, Vol.2018 (8), p.1-21, Article 126

Ort / Verlag

Berlin/Heidelberg: Springer Berlin Heidelberg

Erscheinungsjahr

2018

Link zum Volltext

Quelle

EZB Free E-Journals

Beschreibungen/Notizen

• A bstract For a generic Higgs boson, measuring the relative sign and magnitude of its couplings with the W and Z bosons is essential in determining its origin. Such a test is also indispensable for the 125-GeV Higgs boson. We propose that the ratio of the HW W and HZZ couplings λ W Z can be directly determined through the W + W − H production, where H denotes a generic Higgs boson, owing to the tree-level interference effect. While this is impractical at the LHC due to the limited sensitivity, it can be done at future e + e − colliders, such as a 500-GeV ILC with the beam polarization P ( e − , e + ) = (−0 . 8 , +0 . 3) in the jjℓ ± bb and ℓ ± ℓ ± ℓ ∓ jj channels. The discovery potential of a general ratio and the power to discriminate it from the SM value are studied in detail. Combining the cross section of e + e − → W + W − H with the measurements of HZZ coupling at the HL-LHC, one can further improve the sensitivity of λ W Z .